If $\alpha, \beta\:and\:\gamma$ are the corresponding angles of the sides a, b and c are respectively in an oblique triangle, then according to law of cosine, the value of the square of the side is

Question

Accepted Answer

$c^{2}=a^{2}+b^{2}-2ab\cos\alpha$

Answer

$c^{2}=a^{2}+b^{2}+2ab\cos\alpha$

Answer

$c^{2}=b^{2}+c^{2}+2bc\cos\alpha$

Answer

$c^{2}=b^{2}+c^{2}-2bc\cos\alpha$